Grille



Patented Aug. 31, 1937 UNITED STATES GRILLE- Edward L. Anderson, GrosseIsle, Mich., assignor to American Blower Corporation,

Detroit,

Mich., a corporation of Delaware Application April 3, 1936, Serial No.72,571

8 Claims.

generally to grilles for particularly to My invention relates thediffusion Yof air and more stamped sheet metal grilles.

One of the objects of my invention is to provide a new and improvedgrille for diffusing air and 'one which is inexpensive to manufacture.

Another object of my invention is to provide a grille constructed ofsheet metal so that it can be manufactured at low cost, and having air10 passages defined by portions formed out of the grille to provide foreflicient diffusion of air.

Another object of my invention is to provide a grille of the abovementioned character through which air may be discharged under pressure,and

at high velocity, without resultant noise.

Another object of my invention is to provide a grille for the diffusionof air and one which will induce rapid mixing of the air dischargedtherethrough with the room air at the face of the grille.

The invention consists in an improved grille construction, to be morefully described hereinafter and the novelty of which will beparticularly pointed out and distinctly claimed.

In the accompanying drawing, to be taken as a part of thisspecification, I have fully and clearly illustrated my invention, inwhich drawing-'- Figure 1 is a view in front elevation of my grille;

Fig. 2 is an enlarged fragmentary view shown in cross section and takenalong the line 2 2 of Fig. 1, and

Fig. 3 is a view similar to Fig. 2, of a. portion of my grille forillustrating how flow of air is affected by my grille.

Referring to the drawing by characters of reference the numeral Idesignates in` general my grille, the particular type of grille shownbeing adapted for the diffusing of air discharged into a room. Thegrille I is constructed of a single sheet of sheet metal, or plate 2, bya stamping' i operation, one side of the plate, as at 3, constitutingthe face of the grille. Preferably the plate 2 is formed`v having acontinuous flange 4 along its side and end edges and which extendsrearwardly of the face of the grille and preferably flares outwardly, asshown. 'I'he grille I is adapted to be fixed to a wall 5 of a room andin overlying relation to an opening 6 in the wall with the edge of theflange l in engagement with the wall surface of the room side.Preferably the plate 2 is provided with aperturesl 1 for receivingscrews 8, or other suitably attaching means for securing the grille to awall of a room, and preferably the apertures 'I are counter-punched asshown, so that the screw heads can be substantially flush with the faceof the grille.

The plate 2 is provided with a plurality of spaced openings or aperturesI0 for the passage of air and, in the present instance, these openingsare of elonga'ted form-and arranged with their longitudinal axesextending vertically with relation to the top and bottom edges pf thegrille. Formed out of the plate 2 around each of the openings I Il thereis a continuous annular flange 10 formed having a portion Il whichextends rearwardly of the face of the grille, and having a reentry. orrebent portion I2 disposed within the confines of the flange portion II.The inner wall surfaces of the rebent portions I2 define a plulo ralityof passages I3 for the discharge of air into a room. The rebent portionsI2 are in spaced relation to their respective flange portions IIformingoutwardly facing channels I5. Preferably the outer edges of therebent portions I2 20 terminate flush with the face of the grille toprovide a finished and neat appearing structure. The portion of theflange between the portion I I and the rebent portion I2 is preferablyrounded,

as at I4, to induce the flow of air into the flow 25 passage I3. A sheetof sound deadening material I5, such as felt, is fixed to the rear faceor back of the grille I `and has a plurality of elongated apertures orcutouts for receiving the rearwardly extending flanges around eachopening. 30 The sound deadening material I5 prevents the impingement ofthe air against the flat surfaces l between openings in the grille andmay be glued or otherwise suitably secured to the grille plate. Byreason of the rounded edges I4 defining the inlet openings of the airpassages, air will be drawn and induced to flow into said passages atangles to the grille plate, as indicated in Fig. 3. Also, the roundededges defining the inlets have the effect of a dam and cause the airentering the 40 passages to crowd thereinto and to be evenlydistributed. In addition, the rounded edges I4 -provide for a gradualreduction in the velocity oi' the air as it enters the grille passageswith the result that noise or whistling of the air, due to 45 ,abruptchanges in its velocity, is substantially eliminated. In grilles havingopenings defined by square edges it has been found that the effectivecapacity of the openings is only about whereas in my grille having therounded edges I I, the effective capacity of the openings issubstantially Air discharging into the room causes a low pressure areaat or adjacent the face of the grille, into which area the room airflows and isdrawn into the air streams. In my grille 55 the annularoutwardly facing channels il provide spaces back of the air dischargeopenings in which the pressure is reduced by the velocity of thedischarging of air streams. Room air thus 5 flows into the spacesdefined by the channels around each opening and is drawn into the airstreams substantiallyparallel to the streams of primary air.

By providing a grille constructed of sheet metal it will be understoodthat it can be constructed very economically, and by forming thedischarge passages by the flanges formed out of plate 2 and having therebent portions providing rounded edges dening the openings to thepassageways. a grille is provided which is both economical inconstruction and efilcient in the discharge and diffusion of air.

What I claim and desire tosecure by Letters Patent of the United Statesis:

1. A grille for the discharge of air comprising a plate member having aplurality of openings therein for the passage of air, said plate havinga continuous ilange around each opening with said flanges each having areentry portion delining passageways for air.

2. A stamped grille for the discharge-of air comprising a sheet metalplate having a plurality of openings for the passage of air, said sheetmetal plate having a continuous flange around each opening and a rebentcontinuous portion defining passageways for air.

3. A stamped sheet metal grille comprising a plate member having aplurality of. openings therethrough, said plate having a bent continuouslateral flange portion around each opening and a continuous rebentportion in spaced relation to said flange portion and definingpassageways for air.

4. A sheet metal grille for the discharge of air therethrough comprisinga plate member having a plurality of openings through which the airpasses, one side of said plate constituting the face of the grille, saidplate having a `continuous flange portion around each opening andextending rearwardly of the face of the grille and having a reentryportion extending toward the face of said grille and terminatingsubstantially flush therewith, each of said reentry portions dening apassageway for air.

5. A sheet metal grille for the discharge of air therethrough comprisinga single sheet metal plate having a plurality of openings therein forthe passage of air, one side of said sheet metal plate constituting theface of the grille, said sheet metal plate having a continuous flangeportion around each opening and extending rearwardly from the face ofthe plate, said flange portions each having a rebent continuous flangeportion in spaced relation thereto and extending toward and terminatingsubstantially flush with lthe face of the grille and forming outwardlyfacing channels around each opening, said rebent portions defining saidopenings with the portion between lthe flange portion and the rebentportion of each opening being rounded to induce air to flow through theopenings.

6. A grille structure for the diffusion of air comprising a sheet metalplate member having a plurality of spaced openings therethrough for air,one side of, said plate member constituting the face of the grille, saidplate member having a rearwardly extending annular ilange portion aroundeach opening and an annular rebent portion disposed in spaced relationto and within the confines of said rearwardly extending por-V tion andextending toward the face of the grille, said rebent portions definingpassageways for air with the wall portions between the rearwardlyextending flange portions and the rebent portions defining the inlets tothe passageways and being rounded to induce flow thereinto.

'7. A grille for diffusing air comprising a plate member having aplurality of openings therethrough, said plate member having a flangearound each of said openings with said flanges each having a reentryportion defining passageways for air.

A 8. A grille for diffusing air comprising a plate member having aplurality of openings therethrough, said plate member having a nangearound each of said openings, with said ilanges each having a reentryportidn defining passageways for air, the plate portion between each ofsaid flanges and their"respective reentry portions being `rounded toinduce crowding of air into 4 the air passageways.

EDWARD L. ANDERSON.

